Composition of matter.



UNITED STATES PATENT OFFICE.

JOSEPH R. C. MARSH, OF CINCINNATI, OHIO, ASSIGNOB TO MARSH STEEL COMPANY,

' A CORPORATION OF OHIO.

comrosrrlon or MATTER.

No Drawing.

' new and useful Improvements in Composition of Matter, of which the following is a specification.

My invention relates to a composition of matter for treating cast iron and steel in the ladle or crucible, and it consists in the various ingredients hereinafter described.

An object of myinvention is to treat metal in the ladle or crucible which will impart to the metal certain qualities that are ment. Thus it is my object to increase the toughness of the metal, to add to its strength, to give it a finer grain, to remove objectionable substances such as phosphorus, sulfur, et c., and in short to make of the iron or steel a better product than that which .usually comes from the ladle or crucible.

Other objects and advantages will appear I in the following specification.

In carrying out my invention I make use of a chemical mixture with which the metal is treated while in a molten state, and which acts on the metal in the manner hereinafter described. This mixture is composed of titanium, chromium, copper, boron, and arsenic 'in one form or another. Thus I may use ferro titanium or acopper'compound of titanium; sesquioxid of chromium, ferro chromium or a copper compound .of chromium; white arsenlc oxid or any other form of arsenic; boric acid or Borax. With the materials mentioned above I use metallic copper.

As an example of the chemical mixture which gives good results I may cite the following: Ferro titanium 2%, metallic copper 1.50%, chromium boric acid 20%, arsenic :.20%. This table gives the per cent. of the weight of each ingredient as comared with the total weight of the metal to e treated. In the case of cast iron, a definite portion of the mixture is placed in the ladle and the Specification of Letters Patent.

Patented May 28,1912.

Application filed August 8, 1911. Serial No. 642,138.

molten metal is poured on it The ladle is held for three or'four minutes to give the chemicals a chance to act- In the case of cast steel the molten steel is held from five to ten minutes before pouring. The action of the chemicals tends to raise the heat slightly so that the metals will pour easily. During the treatment certain objectionable substances such as sulfur, phosphorus, etc., are removed.

Cast iron produced by this process has the following -properties:The ironis harder and the grain finer. The metal has a greaterelastic limit and a greater tensile strength.

Both the iron and steel are hot hard,

(2., they retain their rigid form at high temperatures and in this respect resemble high speed steel. They take a high polish.

The temperature at which the metals are cast is that for the ordinary casting purposes, but if the metals are to be quenched after casting care should be taken in regulating the temperature of themetal. Thus it should not be carried much beyond 1325 Fahrenheit. Steel castings will always be found to be better when heated after casting and then quenched, especially so when high elastic limit and tensile strength are required. I

It will be obvious from what has been stated that other ingredients than those given in the example may be used. The proportions also may be varied within limits in accordance with the metal to be treated.

I claim: 1.-The herein described composition 'of matter for treating metals, which consists of a chemical mixture containing titanium, chromium, copper, boron, and arsenic.

2. The herein described composition of matter for treatin metals, which consists of a chemical mixture containing ferro titanium, chromium sesquioxid, metallic copper, boric acid, and arsenic oxid.

JOSEPH R. C. MARSH.

v Witnesses:

Acmcs H. LITTLE-JOHN, Fmncns V. MARSH. 

